Class BeanContextServicesSupport

public class BeanContextServicesSupport
extends BeanContextSupport
implements BeanContextServices

This helper class provides a utility implementation of the java.beans.beancontext.BeanContextServices interface.

Since this class directly implements the BeanContextServices interface, the class can, and is intended to be used either by subclassing this implementation, or via delegation of an instance of this class from another through the BeanContextProxy interface.

Fields

services

protected transient HashMap services

all accesses to the protected transient HashMap services field should be synchronized on that object

serializable

protected transient int serializable

The number of instances of a serializable BeanContextServceProvider.

proxy

protected transient BeanContextServicesSupport.BCSSProxyServiceProvider proxy

Delegate for the BeanContextServiceProvider.

bcsListeners

protected transient ArrayList bcsListeners

List of BeanContextServicesListener objects.

Constructors

BeanContextServicesSupport

public BeanContextServicesSupport(BeanContextServices peer,
                                  Locale lcle,
                                  boolean dTime,
                                  boolean visible)

Parameters:

peer - The peer BeanContext we are supplying an implementation for, if null the this object is its own peer

lcle - The current Locale for this BeanContext.

dTime - The initial state, true if in design mode, false if runtime.

visible - The initial visibility.

BeanContextServicesSupport

public BeanContextServicesSupport(BeanContextServices peer,
                                  Locale lcle,
                                  boolean dtime)

Create an instance using the specified Locale and design mode.

Parameters:

peer - The peer BeanContext we are supplying an implementation for, if null the this object is its own peer

lcle - The current Locale for this BeanContext.

dtime - The initial state, true if in design mode, false if runtime.

BeanContextServicesSupport

public BeanContextServicesSupport(BeanContextServices peer,
                                  Locale lcle)

Create an instance using the specified locale

Parameters:

peer - The peer BeanContext we are supplying an implementation for, if null the this object is its own peer

lcle - The current Locale for this BeanContext.

BeanContextServicesSupport

public BeanContextServicesSupport(BeanContextServices peer)

Create an instance with a peer

Parameters:

peer - The peer BeanContext we are supplying an implementation for, if null the this object is its own peer

BeanContextServicesSupport

public BeanContextServicesSupport()

Create an instance that is not a delegate of another object

Methods

initialize

public void initialize()

called by BeanContextSupport superclass during construction and deserialization to initialize subclass transient state. subclasses may envelope this method, but should not override it or call it directly.

Overrides:

initialize in class BeanContextSupport

getBeanContextServicesPeer

public BeanContextServices getBeanContextServicesPeer()

Gets the BeanContextServices associated with this BeanContextServicesSupport.

Returns:

the instance of BeanContext this object is providing the implementation for.

createBCSChild

protected BeanContextSupport.BCSChild createBCSChild(Object targetChild,
                                                     Object peer)

Overrides:

createBCSChild in class BeanContextSupport

Parameters:

targetChild - the child to create the Child on behalf of

peer - the peer if the targetChild and peer are related by BeanContextProxy

createBCSSServiceProvider

protected BeanContextServicesSupport.BCSSServiceProvider createBCSSServiceProvider(Class sc,
                                                                                   BeanContextServiceProvider bcsp)

subclasses can override this method to create new subclasses of BCSSServiceProvider without having to override addService() in order to instantiate.

Parameters:

sc - the class

bcsp - the service provider

Returns:

a service provider without overriding addService()

addBeanContextServicesListener

public void addBeanContextServicesListener(BeanContextServicesListener bcsl)

add a BeanContextServicesListener

Specified by:

addBeanContextServicesListener in interface BeanContextServices

Parameters:

bcsl - the BeanContextServicesListener to add

Throws:

NullPointerException - if the argument is null

removeBeanContextServicesListener

public void removeBeanContextServicesListener(BeanContextServicesListener bcsl)

remove a BeanContextServicesListener

Specified by:

removeBeanContextServicesListener in interface BeanContextServices

Parameters:

bcsl - the BeanContextServicesListener to remove from this context

addService

public boolean addService(Class serviceClass,
                          BeanContextServiceProvider bcsp)

add a service

Specified by:

addService in interface BeanContextServices

Parameters:

serviceClass - the service class

bcsp - the service provider

Returns:

true if the service was successful added, false otherwise

addService

protected boolean addService(Class serviceClass,
                             BeanContextServiceProvider bcsp,
                             boolean fireEvent)

add a service

Parameters:

serviceClass - the service class

bcsp - the service provider

fireEvent - whether or not an event should be fired

Returns:

true if the service was successfully added

revokeService

public void revokeService(Class serviceClass,
                          BeanContextServiceProvider bcsp,
                          boolean revokeCurrentServicesNow)

remove a service

Specified by:

revokeService in interface BeanContextServices

Parameters:

serviceClass - the service class

bcsp - the service provider

revokeCurrentServicesNow - whether or not to revoke the service

hasService

public boolean hasService(Class serviceClass)

has a service, which may be delegated

Specified by:

hasService in interface BeanContextServices

Parameters:

serviceClass - the service in question

Returns:

true if the service is available

getService

public Object getService(BeanContextChild child,
                         Object requestor,
                         Class serviceClass,
                         Object serviceSelector,
                         BeanContextServiceRevokedListener bcsrl)
                  throws TooManyListenersException

obtain a service which may be delegated

Specified by:

getService in interface BeanContextServices

Parameters:

child - the BeanContextChild associated with this request

requestor - the object requesting the service

serviceClass - class of the requested service

serviceSelector - the service dependent parameter

bcsrl - the BeanContextServiceRevokedListener to notify if the service should later become revoked

Returns:

a reference to this context's named Service as requested or null

Throws:

TooManyListenersException - if there are too many listeners

releaseService

public void releaseService(BeanContextChild child,
                           Object requestor,
                           Object service)

release a service

Specified by:

releaseService in interface BeanContextServices

Parameters:

child - the BeanContextChild

requestor - the requestor

service - the service

getCurrentServiceClasses

public Iterator getCurrentServiceClasses()

Description copied from interface: BeanContextServices

Gets the currently available services for this context.

Specified by:

getCurrentServiceClasses in interface BeanContextServices

Returns:

an iterator for all the currently registered service classes.

getCurrentServiceSelectors

public Iterator getCurrentServiceSelectors(Class serviceClass)

Description copied from interface: BeanContextServices

Gets the list of service dependent service parameters (Service Selectors) for the specified service, by calling getCurrentServiceSelectors() on the underlying BeanContextServiceProvider.

Specified by:

getCurrentServiceSelectors in interface BeanContextServices

Parameters:

serviceClass - the specified service

Returns:

an iterator for all the currently available service selectors (if any) available for the specified service.

serviceAvailable

public void serviceAvailable(BeanContextServiceAvailableEvent bcssae)

BeanContextServicesListener callback, propagates event to all currently registered listeners and BeanContextServices children, if this BeanContextService does not already implement this service itself. subclasses may override or envelope this method to implement their own propagation semantics.

Specified by:

serviceAvailable in interface BeanContextServicesListener

Overrides:

serviceAvailable in class BeanContextChildSupport

Parameters:

bcssae - The BeanContextServiceAvailableEvent fired as a result of a service becoming available

serviceRevoked

public void serviceRevoked(BeanContextServiceRevokedEvent bcssre)

BeanContextServicesListener callback, propagates event to all currently registered listeners and BeanContextServices children, if this BeanContextService does not already implement this service itself. subclasses may override or envelope this method to implement their own propagation semantics.

Specified by:

serviceRevoked in interface BeanContextServiceRevokedListener

Overrides:

serviceRevoked in class BeanContextChildSupport

Parameters:

bcssre - The BeanContextServiceRevokedEvent fired as a result of a service being revoked

getChildBeanContextServicesListener

protected static final BeanContextServicesListener getChildBeanContextServicesListener(Object child)

Gets the BeanContextServicesListener (if any) of the specified child.

Parameters:

child - the specified child

Returns:

the BeanContextServicesListener (if any) of the specified child

childJustRemovedHook

protected void childJustRemovedHook(Object child,
                                    BeanContextSupport.BCSChild bcsc)

called from superclass child removal operations after a child has been successfully removed. called with child synchronized. This subclass uses this hook to immediately revoke any services being used by this child if it is a BeanContextChild. subclasses may envelope this method in order to implement their own child removal side-effects.

Overrides:

childJustRemovedHook in class BeanContextSupport

Parameters:

child - the child

bcsc - the BCSChild

releaseBeanContextResources

protected void releaseBeanContextResources()

called from setBeanContext to notify a BeanContextChild to release resources obtained from the nesting BeanContext. This method revokes any services obtained from its parent. subclasses may envelope this method to implement their own semantics.

Overrides:

releaseBeanContextResources in class BeanContextChildSupport

initializeBeanContextResources

protected void initializeBeanContextResources()

called from setBeanContext to notify a BeanContextChild to allocate resources obtained from the nesting BeanContext. subclasses may envelope this method to implement their own semantics.

Overrides:

initializeBeanContextResources in class BeanContextChildSupport

fireServiceAdded

protected final void fireServiceAdded(Class serviceClass)

Fires a BeanContextServiceEvent notifying of a new service.

Parameters:

serviceClass - the service class

fireServiceAdded

protected final void fireServiceAdded(BeanContextServiceAvailableEvent bcssae)

Fires a BeanContextServiceAvailableEvent indicating that a new service has become available.

Parameters:

bcssae - the BeanContextServiceAvailableEvent

fireServiceRevoked

protected final void fireServiceRevoked(BeanContextServiceRevokedEvent bcsre)

Fires a BeanContextServiceEvent notifying of a service being revoked.

Parameters:

bcsre - the BeanContextServiceRevokedEvent

fireServiceRevoked

protected final void fireServiceRevoked(Class serviceClass,
                                        boolean revokeNow)

Fires a BeanContextServiceRevokedEvent indicating that a particular service is no longer available.

Parameters:

serviceClass - the service class

revokeNow - whether or not the event should be revoked now

bcsPreSerializationHook

protected void bcsPreSerializationHook(ObjectOutputStream oos)
                                throws IOException

called from BeanContextSupport writeObject before it serializes the children ... This class will serialize any Serializable BeanContextServiceProviders herein. subclasses may envelope this method to insert their own serialization processing that has to occur prior to serialization of the children

Overrides:

bcsPreSerializationHook in class BeanContextSupport

Parameters:

oos - the ObjectOutputStream to use during serialization

Throws:

IOException - if serialization failed

bcsPreDeserializationHook

protected void bcsPreDeserializationHook(ObjectInputStream ois)
                                  throws IOException,
                                         ClassNotFoundException

called from BeanContextSupport readObject before it deserializes the children ... This class will deserialize any Serializable BeanContextServiceProviders serialized earlier thus making them available to the children when they deserialized. subclasses may envelope this method to insert their own serialization processing that has to occur prior to serialization of the children

Overrides:

bcsPreDeserializationHook in class BeanContextSupport

Parameters:

ois - the ObjectInputStream to use during deserialization

Throws:

IOException - if deserialization failed

ClassNotFoundException - if needed classes are not found